/*
    Copyright 2009, Felspar Co Ltd. http://fost.3.felspar.com/
    Distributed under the Boost Software License, Version 1.0.
    See accompanying file LICENSE_1_0.txt or copy at
        http://www.boost.org/LICENSE_1_0.txt
*/

#include "fost-inet.hpp"
#include <fost/detail/pop3.hpp>

#include <boost/regex.hpp>


using namespace fostlib;


bool fostlib::email_is_an_ndr( const text_body &email ) {
    string subject = email.headers()["Subject"].value();
    return
        ( // Proper NDRs should have this Content-Type and contain a recording of a 500 response
            email.headers()["Content-Type"].subvalue("report-type") == "delivery-status"
            && (
                email.text().underlying().find("Status: 5") != string::npos
                || subject.find("Undeliverable: ") == 0
            )
        ) || (
            subject == "Delivery failure"
            || subject == "Delivery Notification: Delivery has failed"
            || subject == "Delivery Report (Failure)"
            || subject == "Delivery Status Notification (Failure)"
            || subject == "failure notice"
            || subject == "Mail delivery failed: returning message to sender"
            || subject == "Undelivered Mail Returned to Sender"
        ) || (
            subject.find("DELIVERY FAILURE:") == 0
            || subject.find("Undeliverable: ") == 0
        )
    ;
}


namespace {
    const boost::regex c_delay_regex("^Warning: message delayed \\d+ .+?$");
}
bool fostlib::email_is_a_delay_report( const text_body &email ) {
    string subject = email.headers()["Subject"].value();
    return
        ( // Many don't have the correct report-type
            // email.headers()["Content-Type"].subvalue("report-type") == "delivery-status" &&
            subject == "Delivery Status Notification (Delay)"
        ) || boost::regex_match( coerce< utf8_string >(subject).underlying(), c_delay_regex )
    ;
}


bool fostlib::email_is_out_of_office( const text_body &email ) {
    string subject = email.headers()["Subject"].value();
    return
        (
            subject == "I'm out of the office"
            || subject.find("I am out of the office") == 0
            || subject.find(" is out of the office") != std::string::npos
            || subject.find("Out of Office") == 0
            || subject.find("Out of Office AutoReply: ") == 0
            || subject == "Vacation reply"
        )
    ;
}